function unselectall(){
   /* if(document.myform.chkAll.checked){
 document.myform.chkAll.checked = document.myform.chkAll.checked&0;
    }*/
}
function CheckAll(form){
  for (var i=0;i<form.elements.length;i++){
    var e = form.elements[i];
    if (e.Name != 'chkAll'&&e.disabled==false)
       e.checked = form.chkAll.checked;
    }
}